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When the cutting edge of a knife is put against a fast rotating

stone to sharpen it, sparks are seen to fly. Explain the reason.

Science - Exemplar Problems

Chapter 12. Friction


The reason of sparks is friction.between the knife and rotatory stone.
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Due to friction between knife and the rotating stone, the edge of metal knife becomes very hot. And small particles of the knife tear away from the hot edge. Due to excessive heat, the small particles glow which are seen as spark.
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